Skiving-machine



N mm2. P t i d M I4, |899.

o A. Y. Annmaws. a e e ar SKIVING MACHINE. (Application mea Sept. 4,1897.)

(N0 Model.)

v nventor.

Witnesses.

Attorney.

UNITED STATES PATENT OFFICE.

ADOLPI-IUS Y. ANDREWS, OF PHILADELPHIA, PENNSYLVANIA.

SKIVING-IVIACHINE.

SPECIFICATION forming part of Letters Patent No. 621,012, dated March14, 1899. Application led September 4, 1897. Serial No. 650,574. (Nomodel.)

To all whom iv' may concern:

Be it known that I, .ADoLPHUs Y. ANDREWS, of the city and county ofPhiladelphia, State of Pennsylvania, have invented au Improvement inSkiving-Machines, of Which the following is a specification.

My invention has reference to leather-skivi'ng machines; and it consistsof certain improvements which are fully set forth in the followingspecification and shown in the accompanying drawings, which form 'a partthereof.

The objectof my invention is to provide a suitable compact form ofskiving-machine for reducing the thickness of leather, along the edgesof sheets thereof, by abrading or rubbing off the excess in thickness,and this I perform in a specially-constructed apparatus adapted tosecure the results in a uniform manner with absolute reliability,quickness, and cleanliness.

In carrying out my invention I provide a suitable frame in Which isjournaled a cylinder having a transverse groove in which is driven apiece of Wood or other soft material, andabout such cylinder I Wrap anabradingsheet of sandpaper, emerycloth,or other suitable material of thelike character and secure it thereto by tacks driven into the saidWooden portion of the cylinder. This cylinder is preferably'Wellbalanced and driven at a high speed, so as to rub upon the under side ofthe leathermfhich is guided thereto by a suitable table and held towardthe abrading-roller by means of an adjustable guide adapted to beadjusted to or from the roller to any desired degree, so as to controlthe thickness of the leather at its skived part. lThe adjustment is suchthat the guide may be quickly dravvn away from the abrading-roller, soas to permit the removal of the skived leather Without abrasion, Whileat the same time it doesnot derange the adjustment of the said guideWhen brought toward the cylinder again. Furthermore,in connection withan apparatus of this character I prefer to employ a suctiontube arrangedadjacent to the abrading-cylinder, so as to carry 0H the abradedportions of the leather, the end of the said suctiontube being providedWith a hinged or Inovable portion adapted to be moved under the actionof the adjustable guide, so as to be moved to or from the abradingcylinder or roller simultaneously with the adjustment of the said guide.The adjustable portion of the suction-tube is designed tocause thesuction to exert its influence close to the said adjustable guide, Whichis the principal place Where the abrading action occurs.

My invention will be better understood by reference to the accompanyingdrawings,in which- Figure 1 isa plan vieWof askiving-machine embodyingmy improvements. Fig. 2 is a sectional elevation of same on line oc Fig.3 is a cross-section on line ,z .e of Fig. 2. Fig.

4 is an enlarged vieW of a portion of Fig. 2;v

and Fig. 5 is a sectional elevation of one end of the cylinder, showin gthemeaus for counterbalancing. j Av is the frame of my improved machine.

B is a transverse shaft journaled in the frame by bearings E.

D is a band-pulley secured to the shaft B and by which it is rotated ata high speed under the action of a belt.

C is a cylinder secured to the shaft B and provided With a transversedovetail groove f, extending entirely across it and in which is placed alayer of Wood F of preferably some- What less thickness than the depthofthe groove. As this cylinder revolves at a very high speed it isessential that it should be nicely balanced topprevent liability toinjury and also to avoid undue Wear upon the journals. To accomplishthis balancing, I provide each head of the cylinder with a series ofapertures c, arranged about the shaft B, as near the periphery as isconsistent With strength. Into these apertures I drive counterweights oflead R2 and fill the excess of spaces by plugs of Wood R', which areheld in place by a cap or plate S, secured to the heads by screws T. Inthis manner the counterbalancing can be actually accomplished, so thatthe machine rests perfectly true.

G is a sheet of sandpaper or other suitable abrading substance, Which'is Wrapped about the cylinder C, with the ends lapping over the Woodenpiece or plug F, to which it is tacked, as at g. In this manner thelayerof sandpaper is rapidly carried around With the IOO rotation of thecylinder G and moves in a circular space.

H is an inclined table fitting in grooveguides I at each side of themachine and form- `ing part of the main frame A. This table to apivot-ed frame formed of two cast-ironl heads K, secured together bybolts T S', the latter acting as a journal for the rod L, leadingdownward to a treadle M, which is weighted at m, so as to normallypulldown therod L and move the frame about its pivot-point 7c, and therebyraise or move the guide .I away l from the cylinder C. By pressing uponthe treadle M with the foot the guide J is moved toward the cylinder C,the extent of such movement being'controlled by means of theadjusting-screws O, passing through the main frame A and provided withlock-nuts Q. Vhen the rear end of the frame K T S' is elevated under theaction of the treadle, it finally comes to rest against the screws O,andthereby limits the downward motion of the guide J. The distance betweenthe guide J and the cylinder C governs the thickness of the skivedportion of the leather.

The lower and forward portion of the cylinder C is inclosed in a box P,carried by the of a revolving cylinder having its surface cov- Ieredwith a sheet of sandpaper or cloth, a lfeed-table yfor guiding thematerial to the iskiving-cylinder, a guidefor holding the mamain frame,and supported upon the rear part of the box P is the suction-tube N,which partly incloses the rear portion of the cylinder C.

The upper portion of the tube N is provided with a pivot-plate n, hingedat N', the free end of which rests upon'the guide J, so as to rise andfall with it. An opening T2 is left between the plate n and the guide J,so as to permit the ready passage of air to enable the carrying off ofthe abrading portions of the leather and preventthe clogging or soilingof the machine. Vithout this aperture T2 the air would have to come inwholly from the sides, which ordinarily is not satisfactory on a largewidth of leather.

The table II is adapted to be adjusted in its guides and may be retainedin any adjusted position by means of the two side clamps R R, which arepressed forward upon the edges of the wood table by means of springs yr.In this manner the adjustment of the table is readily and easily made.

The minor details of construction may be modin'ed without departing fromthe principles of my invention.

What I claim as new, and desire to secure by Letters Patent, is

1. In a skiving-machine, the combination of a revolving cylinder havinga longitudinal groove or recess on its periphery, a piece of soft`material such as wood into which a fastening device may be drivenfitting into said groove and having its outer surface slightly below theouter surface of the cylinder, a sheet of abrading material ofslightly-greater length than the circumference of the cylinder wrappedtightly about said cylinder and having its two ends directly lapped uponeach other over the surface of the soft material and lying substantiallyparallel to the circumference of the cylinder, and fastening meansdirectly connecting with and supported Aby the soft material for tightlyholding both ends of the sheet of abrading material firmly to the saidsoft filling in the recessed portion Qof the cylinder, the'Aconstruction being such tthat the outer surface of the abrading materialover the recessed portion does not extend above the outerabrading-surface of the cylinder. t

2. In a skiving-machine, the combination of a revolving cylinder havinga sheet of sandpaper or abrading-cloth wrapped tightlyabout it, afeed-table for guiding the material to the skiving-cylinder, a guide forholding the material to the cylinder arranged beyond the end of thetable, means for adjusting the guide to ,or from the cylinder consistingof a movable 1frame pivoted in fixed bearings and carrying the guide,adjustable stops for limiting the oscillation of the frame and guide inone difrection, a weighted treadleto normally move the frame away fromthe adjustable stop, and Sa connection between the treadle and thepivoted frame.

3. In a striving-machine, the combination terial to the cylinder, meansfor adjusting the vguide to or from the cylinder consisting of a rockingframe pivoted in fixed bearings carlrying the guide at one end,adjustable stops :for limiting the oscillation of the frame in onedirection, a weighted treadle connecting lwith the other end of theframe to normally move it away from the adjustable stop and under theaction of the foot-pressure to move the revolving cylinder.

4. In a skiving-machine, the combination of end frames Ahaving bearingsE, an abrading-cylinder C j ournaled therein, a work-supporting table HVcarried by the frames A and having its end arranged tangentially to thecylinder, a solid frame P secured to the frames A and curved to inclosethe lower forward part of the cylinder, a sheetmetal suction tube orcase N supported by the frame P and continuing the inclosing of thecylinder on all sides except adjacent to the table and terminating atthe top in an adjustable section, and a movable guide adjustable to andfrom the cylinder supportin g the adjustable section ICO of thesuction-case adjacent tothe table and at the exposed part of thecylinder.

5. In a skiving-machine, the combination of a revolving cylinderhavingits surface covered with an abrading material, an adjustable guidemovable to or from the cylinder, a table over which the material is fedarranged substantially tangential to the cylinder, a-suction-tube havingits open-end arranged adjacent to the cylinder on the side opposite tothe feed-table and adjustable guide, and a pivoted plate hingedto theupper part of the tube and having its free end connecting with theadjustable guides so as to be movable therewith. Y

6. In a skiving-machine7 the combination of a'pivoted cylinder having anabrading-surface, a guide under which the leather to be treatedis'passed, adjusting devices to adjust the guide to or from thecylinder, and a suction-tube arranged at the rear of the guide andhaving an adjustable extended portion thereof projecting over therevolving cylinder and adjacent to the adjustable guide and. movable toor from the abrading-surface.

'7. In a skiving-machine, the combination of a revolving cylinder havingan abradingsurfacej an adjustable guide movable to or from the cylinderand under which the leather is fed, a frame pivoted in fixed bearingsand carrying the guide to hold it firmly at all times parallel to thecylinder, a Weighted treadle device acting upon the pivoted frame tonormally move the guide vaway from the cylinder but under the action ofthe foot to move it toward the cylinder but not in contact therewith,and an adjustable stop device to limit the extent of movement of theguide toward the cylinder and prevent actual contact therewith.

In testimony-of which invention I hereunto set my hand.

A. Y. ANDREWS. Witnesses:

R. M. HUNTER, J. W. KENWORTHY.

